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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Chatbots
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Agents
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DeepSeek
S
Lex
A
Perplexity
S
HeyGen
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Google Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.AI avatar videos. Record once, speak any language.
CategoryChatbotsWritingResearchVideo
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $12/moFree + $20/mo ProFree + $24-$65/mo
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Essays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.Course creators, multilingual marketers, anyone scaling video content.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Pricey for serious volume
  • Long shots still feel off
  • Ethics — easy to misuse
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.
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